Initial tree implementation

There's still a lot to do, but this is actually *something*. The tree hierarchy is displayed using hashes at the start of a line. I want to have it just before the filename, but this will need some changes to the way that columns are handled.

src/dir.rs

@@ -31,11 +31,14 @@ impl Dir {
 
     /// Produce a vector of File objects from an initialised directory,
     /// printing out an error if any of the Files fail to be created.
-    pub fn files(&self) -> Vec<File> {
+    ///
+    /// Passing in `recurse` means that any directories will be scanned for
+    /// their contents, as well.
+    pub fn files(&self, recurse: bool) -> Vec<File> {
         let mut files = vec![];
 
         for path in self.contents.iter() {
-            match File::from_path(path, Some(self)) {
+            match File::from_path(path, Some(self), recurse) {
                 Ok(file) => files.push(file),
                 Err(e)   => println!("{}: {}", path.display(), e),
             }

src/file.rs

@@ -32,6 +32,7 @@ pub struct File<'a> {
     pub ext:   Option<String>,
     pub path:  Path,
     pub stat:  io::FileStat,
+    pub this:  Option<Dir>,
 }
 
 impl<'a> File<'a> {
@@ -39,12 +40,12 @@ impl<'a> File<'a> {
     /// appropriate. Paths specified directly on the command-line have no Dirs.
     ///
     /// This uses lstat instead of stat, which doesn't follow symbolic links.
-    pub fn from_path(path: &Path, parent: Option<&'a Dir>) -> IoResult<File<'a>> {
-        fs::lstat(path).map(|stat| File::with_stat(stat, path, parent))
+    pub fn from_path(path: &Path, parent: Option<&'a Dir>, recurse: bool) -> IoResult<File<'a>> {
+        fs::lstat(path).map(|stat| File::with_stat(stat, path, parent, recurse))
     }
 
     /// Create a new File object from the given Stat result, and other data.
-    pub fn with_stat(stat: io::FileStat, path: &Path, parent: Option<&'a Dir>) -> File<'a> {
+    pub fn with_stat(stat: io::FileStat, path: &Path, parent: Option<&'a Dir>, recurse: bool) -> File<'a> {
 
         // The filename to display is the last component of the path. However,
         // the path has no components for `.`, `..`, and `/`, so in these
@@ -58,12 +59,23 @@ impl<'a> File<'a> {
         // replacement characters.
         let filename = String::from_utf8_lossy(bytes);
 
+        // If we are recursing, then the `this` field contains a Dir object
+        // that represents the current File as a directory, if it is a
+        // directory. This is used for the --tree option.
+        let this = if recurse && stat.kind == io::FileType::Directory {
+            Dir::readdir(path).ok()
+        }
+        else {
+            None
+        };
+
         File {
             path:  path.clone(),
             dir:   parent,
             stat:  stat,
             name:  filename.to_string(),
             ext:   ext(filename.as_slice()),
+            this:  this,
         }
     }
 
@@ -184,6 +196,7 @@ impl<'a> File<'a> {
                 stat:  stat,
                 name:  filename.to_string(),
                 ext:   ext(filename.as_slice()),
+                this:  None,
             })
         }
         else {

src/main.rs

@@ -39,11 +39,14 @@ fn exa(options: &Options) {
         let path = Path::new(file);
         match fs::stat(&path) {
             Ok(stat) => {
-                if stat.kind == FileType::Directory && options.dir_action != DirAction::AsFile {
+                if stat.kind == FileType::Directory && options.dir_action == DirAction::Tree {
+                    files.push(File::with_stat(stat, &path, None, true));
+                }
+                else if stat.kind == FileType::Directory && options.dir_action != DirAction::AsFile {
                     dirs.push(path);
                 }
                 else {
-                    files.push(File::with_stat(stat, &path, None));
+                    files.push(File::with_stat(stat, &path, None, false));
                 }
             }
             Err(e) => println!("{}: {}", file, e),
@@ -77,7 +80,7 @@ fn exa(options: &Options) {
 
         match Dir::readdir(&dir_path) {
             Ok(ref dir) => {
-                let unsorted_files = dir.files();
+                let unsorted_files = dir.files(false);
                 let files: Vec<File> = options.transform_files(unsorted_files);
 
                 // When recursing, add any directories to the dirs stack

src/options.rs

@@ -45,6 +45,7 @@ impl Options {
             getopts::optflag("R", "recurse",   "recurse into directories"),
             getopts::optopt ("s", "sort",      "field to sort by", "WORD"),
             getopts::optflag("S", "blocks",    "show number of file system blocks"),
+            getopts::optflag("T", "tree",      "recurse into subdirectories in a tree view"),
             getopts::optflag("x", "across",    "sort multi-column view entries across"),
             getopts::optflag("?", "help",      "show list of command-line options"),
         ];
@@ -111,7 +112,7 @@ impl Options {
 /// What to do when encountering a directory?
 #[derive(PartialEq, Debug, Copy)]
 pub enum DirAction {
-    AsFile, List, Recurse
+    AsFile, List, Recurse, Tree
 }
 
 /// User-supplied field to sort by.
@@ -189,7 +190,7 @@ fn view(matches: &getopts::Matches) -> Result<View, Misfire> {
             Err(Misfire::Useless("oneline", true, "long"))
         }
         else {
-            Ok(View::Details(try!(Columns::new(matches)), matches.opt_present("header")))
+            Ok(View::Details(try!(Columns::new(matches)), matches.opt_present("header"), matches.opt_present("tree")))
         }
     }
     else if matches.opt_present("binary") {
@@ -242,12 +243,14 @@ fn file_size(matches: &getopts::Matches) -> Result<SizeFormat, Misfire> {
 fn dir_action(matches: &getopts::Matches) -> Result<DirAction, Misfire> {
     let recurse = matches.opt_present("recurse");
     let list    = matches.opt_present("list-dirs");
-
-    match (recurse, list) {
-        (true,  true ) => Err(Misfire::Conflict("recurse", "list-dirs")),
-        (true,  false) => Ok(DirAction::Recurse),
-        (false, true ) => Ok(DirAction::AsFile),
-        (false, false) => Ok(DirAction::List),
+    let tree    = matches.opt_present("tree");
+
+    match (recurse, list, tree) {
+        (true,  true,  _    ) => Err(Misfire::Conflict("recurse", "list-dirs")),
+        (true,  false, false) => Ok(DirAction::Recurse),
+        (true,  false, true ) => Ok(DirAction::Tree),
+        (false, true,  _    ) => Ok(DirAction::AsFile),
+        (false, false, _    ) => Ok(DirAction::List),
     }
 }
 

src/output.rs

@@ -12,7 +12,7 @@ use ansi_term::Style::Plain;
 
 #[derive(PartialEq, Copy, Debug)]
 pub enum View {
-    Details(Columns, bool),
+    Details(Columns, bool, bool),
     Lines,
     Grid(bool, usize),
 }
@@ -21,7 +21,7 @@ impl View {
     pub fn view(&self, dir: Option<&Dir>, files: &[File]) {
         match *self {
             View::Grid(across, width)       => grid_view(across, width, files),
-            View::Details(ref cols, header) => details_view(&*cols.for_dir(dir), files, header),
+            View::Details(ref cols, header, tree) => details_view(&*cols.for_dir(dir), files, header, tree),
             View::Lines                     => lines_view(files),
         }
     }
@@ -122,7 +122,7 @@ fn grid_view(across: bool, console_width: usize, files: &[File]) {
     }
 }
 
-fn details_view(columns: &[Column], files: &[File], header: bool) {
+fn details_view(columns: &[Column], files: &[File], header: bool, tree: bool) {
     // The output gets formatted into columns, which looks nicer. To
     // do this, we have to write the results into a table, instead of
     // displaying each file immediately, then calculating the maximum
@@ -131,19 +131,22 @@ fn details_view(columns: &[Column], files: &[File], header: bool) {
 
     let mut cache = OSUsers::empty_cache();
 
-    let mut table: Vec<Vec<Cell>> = files.iter()
-        .map(|f| columns.iter().map(|c| f.display(c, &mut cache)).collect())
-        .collect();
+    let mut table = Vec::new();
+    get_files(columns, &mut cache, tree, &mut table, files, 0);
 
     if header {
-        table.insert(0, columns.iter().map(|c| Cell::paint(Plain.underline(), c.header())).collect());
+        table.insert(0, (0, columns.iter().map(|c| Cell::paint(Plain.underline(), c.header())).collect()));
     }
 
     let column_widths: Vec<usize> = range(0, columns.len())
-        .map(|n| table.iter().map(|row| row[n].length).max().unwrap_or(0))
+        .map(|n| table.iter().map(|row| row.1[n].length).max().unwrap_or(0))
         .collect();
 
-    for row in table.iter() {
+    for &(depth, ref row) in table.iter() {
+        for _ in range(0, depth) {
+            print!("#");
+        }
+
         for (num, column) in columns.iter().enumerate() {
             if num != 0 {
                 print!(" ");  // Separator
@@ -161,3 +164,16 @@ fn details_view(columns: &[Column], files: &[File], header: bool) {
         print!("\n");
     }
 }
+
+fn get_files(columns: &[Column], cache: &mut OSUsers, recurse: bool, dest: &mut Vec<(usize, Vec<Cell>)>, src: &[File], depth: usize) {
+    for file in src.iter() {
+        let cols = columns.iter().map(|c| file.display(c, cache)).collect();
+        dest.push((depth, cols));
+
+        if recurse {
+            if let Some(ref dir) = file.this {
+                get_files(columns, cache, recurse, dest, dir.files(true).as_slice(), depth + 1);
+            }
+        }
+    }
+}